1999 Mercury Force 120 lower unit removal

[prodjbm]

Can anyone help me with the details of removing a lower unit from the subject line motor. reason for needing to do this is I am observing oil coming out from a hole above the prop and I was told that there is a seal in the lower unit that could be bad. I am believing this to be true because when changing my lower unit oil not very much came out. Also, what seal would need to be replaced
Thank you
Bill

 

[racerone]

You would test the lower unit with some air pressure to see if there is a leak.----And exactly how much oil came out when you drained it ?

 

[prodjbm]

What exactly would I do to test with air pressure? Sorry, I am new to boating but I am very mechanically inclined. How much oil came out? I would say only about 10 ounces come out of the lower unit when draining, unfortunately there was other oil in the pan it was drained into so that is a guess.

Thanks
BIll

 

[racerone]

Most shops use an adapter with a shreader valve that screw into the drain hole.----Put 5 PSI air pressure on it and observe the gauge.--------You do this testing because you may NOT have an oil leak !-----Oil leaking out of small drain holes is normal.---Yes normal.----That leakage has been discussed on forums hunderds of times.